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I was too lazy to crank up iTunes initially, so I put in "Philippa Ballentine cross-dressing novel" and that led me to dark places I shan't forget anytime soon .
But it's actually http://empresssword.com/ by Paulette Jaxton. Or search for the book title or Paulette Jaxton at iTunes.
Ha! My first post on the FDO's site. Neato!